libcxx/test/std/containers/associative/map/map.observers/key_comp.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <map>
  10
  11 // key_compare key_comp() const;
  12
  13 #include <map>
  14 #include <cassert>
  15 #include <string>
  16
  17 int main(int, char**) {
  18     typedef std::map<int, std::string> map_type;
  19
  20     map_type m;
  21     std::pair<map_type::iterator, bool> p1 = m.insert(map_type::value_type(1, "abc"));
  22     std::pair<map_type::iterator, bool> p2 = m.insert(map_type::value_type(2, "abc"));
  23
  24     const map_type& cm = m;
  25
  26     assert(cm.key_comp()(p1.first->first, p2.first->first));
  27     assert(!cm.key_comp()(p2.first->first, p1.first->first));
  28
  29     return 0;
  30 }